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27251.

The number of drops of water, counted in falling-drop method using stalagmometer is 100, whereas the number of drops of an organic liquid is 280. Calculate the surface tension of the organic liquid if the surface tension of water is 0.07275 Nm^(-1) and the densities of water and the organic liquid are 0.998 xx 10^3 kg m^(-3) and 0.755 xx 10^3 kg m^(-3) respectively.

Answer»


ANSWER :`0.01966 NM^(-1)`
Discussion
27252.

The number of trans positions in a octahedral complex is ________

Answer»

6
4
3
2

Answer :C
Discussion
27253.

The number of three centre two electron bonds in a molecule of diborane is :

Answer»

`0`
`2`
`4`
`6`

ANSWER :B
Discussion
27254.

The number of dipeptides that can be made from alanine and glycine are .

Answer»


Solution :FOUR dipeptides (i)Ala Ala (II)Ala Gly (III)Gly Ala (IV)Gly Gly
Discussion
27255.

The number of transition metals in the alloy Alnico is

Answer»


SOLUTION :N//A
Discussion
27256.

The number of theoretically possible stereoisomers in the following steroid is

Answer»

256
64
8
16

Answer :A
Discussion
27257.

The number of thermoplastic polymers among tefflon, polythene, PVC, polystyrene, bakelite, nylon 6, Melamine formaldehyde, PMMA, are:

Answer»


ANSWER :6
Discussion
27258.

The number of disulphide linkages present in insulin are

Answer»

4
3
2
1

Solution :Three DISULPHIDE LINKAGES. Two in between the two CHAINS and ONE in the SMALLER chain.
Discussion
27259.

The disubstituted aldehyde derivatives with formula C_9 H_(1) O

Answer»


SOLUTION :`C_9 H_(10) O`
Discussion
27260.

The number of the nearest neighbours that surrounding a particle in a crystal is called the ………………

Answer»

SOLUTION :COORDINATION NUMBER
Discussion
27261.

The number of different substitution products possible when ethane is allowed to react with bromine in sunlight are:

Answer»

9
6
8
5

Answer :A
Discussion
27262.

Give example of oxide of chlorine in which oxidation state of Cl is +6 .:

Answer»


ANSWER :D
Discussion
27263.

The number of tetrahedral voids per unit cell in NaCl crystal is .........

Answer»

4 
8 
TWICE the number of octahedral voids. 
Four times the number of octahedral voids. 

Solution :NaCl has ccp structure. Hence, number of NaCl UNITS PER unit cell are 4.
`therefore` Number of TETRAHEDRAL voids `= 2 xx 4 = 8`
Number of octahedral voids = 4 .
Discussion
27264.

The number of different metals present in the ore copper pyrites is

Answer»


SOLUTION :COPPER PYRITES `(CuFeS_(2))` contains copper and iron.
Discussion
27265.

The numberof diferentsubstiutionproductspossiblewhenbromineandethaneareallowedto react, is :

Answer»

6
8
7
9

Solution :Onemono-SUBSTITUTED, twodi-substitutedtwotri -substituted, twotetra- substituted,onepenta -substitutedand onehexa- substituted.]
Discussion
27266.

The number of dichloro derivatives of propane is

Answer»

one
two
three
four

SOLUTION :
Discussion
27267.

The number of dative bonds in sulphuric acid molecule is

Answer»

0
1
2
4

Answer :C
Discussion
27268.

The number of d-electrons retained in Fe^(2+) (At. no. of Fe= 26) ion is

Answer»

4
5
6
3

Solution :ELECTRONIC configuration of `""^(26)Fe=[AR]^(18)3D^(6)4s^(2)`
Electronic configuration of `Fe^(2+)=[Ar]^(18)3d^(6)`
`therefore` No. of d-electrons = 6.
Discussion
27269.

The number of d pi -p pibonds in ClO^(-),ClO_(2)^(-), ClO_(3), ClO_(4)^(-)ionsrespectively are

Answer»

0,1,2,3
1,2,3,4
3,2,1,0
4,3,2,1

Answer :A
Discussion
27270.

The number of d-electrons remained in Fe^(2+) (At.no. of Fe=26)ion is

Answer»

4
5
6
3

Solution :`FE^(2+),3D^(6)`
Discussion
27271.

The number of d-electrons present in 'X' and its magnetic moment are

Answer»

6 and 6.93 B.M.
5 and 5.92 B.M.
5 and 4.9 B.M.
4 and 5.92 B.M.

Answer :B
Discussion
27272.

The number of tetrahedral sites per sphere in ccp structure is

Answer»

1
2
3
4

Answer :B
Discussion
27273.

The number of d-electrons present in Fe^(2+) ions is :

Answer»

6
4
8
3

Answer :A
Discussion
27274.

The number of tetrahedral and octahedral voids in a ccp array of 100 atoms are respectively

Answer»


ANSWER :200 ABD 100
Discussion
27275.

The number of d-electrons of Cr(Z=24) in [Cr(H_2O)_6]^(3+) ion :

Answer»

2
3
4
5

Answer :B
Discussion
27276.

the number of d electrons is Co is equal to that of

Answer»

<P>s and p electrons in F atom
p electrons in Ar
d electrons in `CO^(2+)`
TOTAL No. of ELECTRON in N atom

Answer :C
Discussion
27277.

The number of tetrahedral and octahedral holes in a hexagonal primitive unit cell are

Answer»

8,4
6,12
2,1
12,6

Answer :D
Discussion
27278.

The number of d-electrons in Ni (at. no.= 28) is equal to that of the

Answer»

p ELECTRONS in `F^(-)`
p electrons in Ar
d electrons in `Ni^(2+)`
total electrons in N.

Solution :Electronic configuration of
`""_(28)Ni=1s^(2) 2S^(2) 2p^(6) 3s^(2) 3p^(6) 3d^(8) 4S^(2)`
`NI^(2+)=1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)3d^(8)`
Thus, d-electrons in Ni and `Ni^(2+)` are same.
Discussion
27279.

The number of structure isomers possible from the molecular formula C_(3)H_(9)N is:

Answer»

4
5
2
3

Solution :Structure isomers of `C_(3)H_(9)N` are
`{:(CH_(3)-CH_(2)-CH_(2)-NH_(2)"," CH_(3)-CH-CH_(3)","),("|"),(""NH_(2)):}`
`{:(CH_(3)-NH-CH_(2)-CH_(3)"," CH_(3)-N-CH_(3)),("|"),(""CH_(3)):}`
Total = 4
Discussion
27280.

The number of d-electrons in [Cr(H_2O)_6]^(3+)is:

Answer»

2
3
4
5

Answer :B
Discussion
27281.

The number of structural isomers possible for dibromination of tetramethyl butane

Answer»


SOLUTION :
Discussion
27282.

The number of structural isomers (open and cyclic) possible for an organic compound having molecular formula C_(5)H_(12) is :

Answer»

2
4
3
5

Answer :C
Discussion
27283.

The number of 'd' electrons in Fe^(2+) is not equal to that of

Answer»

s-electrons in MG
p-electrons in NE
p-electrons in Ne
cl-electrons in Fe

Solution : p-electrons in Ne
Discussion
27284.

The number of structural isomers obtained on mono chlorination of 4,4-dimethylcyclohexane

Answer»


SOLUTION :
Discussion
27285.

The number of structural isomers for the compound C_(4)H_(9)I are:

Answer»

SOLUTION :.
Discussion
27286.

The number of d-electrons Fe^(2+)(Z=26) is not equal to that to the

Answer»

p-electron in NE(at no. =10)
d-electrons in Mn (at. No=25)
d-elecrons in FE
p-electrons in `F^(-)` (at no of F=9)

Solution :`Fe^(2+): [Ar]3D^(6)` has six d-electrons
`Ne:1s^(2)2s^(2)2p^(6)` has six p-electrons
`Mn:[Ar]3d^(5)4s^(2)` has FIVE d-electrons
`Fe:[Ar]3d^(6)s^(2)` has six d-electrons
`F^(-):[Ne]3s^(2)3p^(6)`has six p - electrons.
Discussion
27287.

The number of structural isomers for the molecular formula C_(5)H_(11)Br is :

Answer»

8
6
12
5

Answer :A
Discussion
27288.

The number of cyclic ketones (four membered) possible for C_6 H_8O (excluding stereoisomers)

Answer»


SOLUTION :
Discussion
27289.

The number of covalent bonds a halogen atom can form through sp^(3) hybridization

Answer»

2
4
5
3

Solution :`sp^(3)` d HYBRIDATION Ex : `ClF_(3)`
NO. of bond pairs =3, No. of lone pairs =2
No. of COVALENT BONDS =3
Discussion
27290.

The number of coulombs required to reduce 12.3g of nitrobenzene to aniline

Answer»

115800C
5790C
28950C
57900C

Solution :`C_(6)H_(5)NO_(2)+6H^(+)+6e^(-)toC_(6)H_(5)NH_(2)+2H_(2)O`
1 MOLE=123 gm nitrogen requires 7 mole electron `=6xx96500`coulomb CHARGE
`therefore12.3` gm nitrobenzene will require=`(6xx96500xx12.3)/(123)`
`=6xx9650=57900C`.
Discussion
27291.

The number of structural and configurational isomers of a bromo compound, C_5H_9Br, formed by the addition of HBr to 2-pentyne respectively

Answer»

1 and 2
2 and 4
4 and 2
2 and 1

Solution :`underset"pentyne-2"(CH_3-C-=C-CH_2-CH_3+HBr)to CH_3-CH=overset(Br)overset|C-CH_2-CH_2`
(This COMPOUND shows 2 structural and four configurational ISOMERS )
Discussion
27292.

The number of coulombs required to liberate 0.224 dm^(3) of chlorine at 0^(@)C and 1 atm pressure is

Answer»

`2 XX 965`
965/2
965
9650

Solution :`22.4 DM^(3) `= 1 mole of `Cl_(2)`
`THEREFORE 0.224 dm^(3) = 0.01` mole of `Cl_(2)`
As 96,500 COULOMBS `-= 35.5` gm = 0.5 moles of `Cl_(2)`
OR
`(1)/(2)` moles of `Cl_(2) = 96500 implies therefore 0.01` moles
`-= 96500 xx 0.01 xx 2`
`= 965 xx 2` coulombs
Discussion
27293.

The number of structural isomers for C_(6) H_(14) is

Answer»

3
4
5
6

Answer :C
Discussion
27294.

The number of steroisomers possible for a compound of the molecular formula. CH_(3)-CH=CH-CH(OH)-Me is:

Answer»

2
3
4
6

Answer :C
Discussion
27295.

The number of coulombs required to deposit 5.4 g. of Aluminium when the given electrodereaction is represented as Al^(3+) + 3e^(-) to Al

Answer»

`1.83 XX 10^(5) C `
57900 C
`5.86 xx 10^(5) C `
`3F`

ANSWER :B
Discussion
27296.

The number of steroisomers obtained by the bromination of trans-2-butene is:

Answer»

3
2
1
4

Answer :A
Discussion
27297.

The number of stereoisomers possible for the following compound.

Answer»


ANSWER :C
Discussion
27298.

The number of stereoisormeric products fromed in the following reaction is

Answer»

1
8
4
2

Solution :
Discussion
27299.

The number of coulombs required for the deposition of107.87 g of silver is :

Answer»

`96500`
`48205`
`19300`
`10000`

ANSWER :A
Discussion
27300.

The number of cornpounds.’elements oxidised by XeF_2 among following is: HF, HBr, HCl, HI, NH_3, CrF_2, Pt, S_8

Answer»


ANSWER :7
Discussion